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Overview of I/O Memory Area
Section 4-1
4-1-3
Clearing and Holding I/O Memory
Note
1.
Mode changed from PROGRAM to RUN/MONITOR or vice-versa.
2.
The PLC Setup’s
IOM Hold Bit Status at Startup
setting determines wheth-
er the IOM Hold Bit’s status is held or cleared when the PLC is turned ON.
4-1-4
Hot Start/Hot Stop Functions
Operating Mode Changes
Hot Start
Turn ON the IOM Hold Bit to retain all data* in I/O memory when the CPU Unit
is switched from PROGRAM mode to RUN/MONITOR mode to start program
execution.
Hot Stop
When the IOM Hold Bit is ON, all data* in I/O memory will also be retained
when the CPU Unit is switched from RUN or MONITOR mode to PROGRAM
mode to stop program execution.
Area
Mode changed
1
Fatal error generated
PLC power turned ON
Execution of FALS
Other fatal errors
PLC Setup set to
clear IOM Hold Bit
status
2
PLC Setup set to
hold IOM Hold Bit
status
2
IOM Hold
Bit OFF
IOM Hold
Bit ON
IOM Hold
Bit OFF
IOM Hold
Bit ON
IOM Hold
Bit OFF
IOM Hold
Bit ON
IOM Hold
Bit OFF
IOM Hold
Bit ON
IOM Hold
Bit OFF
IOM Hold
Bit ON
CIO
Area
I/O Area
Cleared
Retained
Retained
Retained
Cleared
Retained
Cleared
Cleared
Cleared
Retained
Built-in Analog I/O Areas
(XA CPU Units only)
Data Link Area
CPU Bus Unit Area
Special I/O Unit Area
Serial PC Link Area
DeviceNet Area
Internal I/O Area
Work Area (W)
Cleared
Retained
Retained
Retained
Cleared
Retained
Cleared
Cleared
Cleared
Retained
Holding Area (H)
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Auxiliary Area (A)
Status treatment depends on address.
Data Memory Area (D)
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Timer Completion Flags (T)
Cleared
Retained
Retained
Retained
Cleared
Retained
Cleared
Cleared
Cleared
Retained
Timer PVs (T)
Cleared
Retained
Retained
Retained
Cleared
Retained
Cleared
Cleared
Cleared
Retained
Counter Completion Flags (C)
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Counter PVs (C)
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Task Flags (TK)
Cleared
Cleared
Retained
Retained
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
Index Registers (IR)
Cleared
Retained
Retained
Retained
Cleared
Retained
Cleared
Cleared
Cleared
Retained
Data Registers (DR)
Cleared
Retained
Retained
Retained
Cleared
Retained
Cleared
Cleared
Cleared
Retained
PROGRAM
Retain
I/O memory
CIO and
other areas
MONITOR or RUN
PROGRAM
Retain
MONITOR or RUN
I/O memory
CIO and
other areas
Summary of Contents for Sysmac CP1H
Page 2: ......
Page 3: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised October 2014...
Page 4: ...iv...
Page 10: ...x...
Page 18: ...xviii...
Page 22: ...xxii...
Page 34: ...xxxiv Conformance to EC Directives 6...
Page 76: ...42 Function Blocks Section 1 5...
Page 176: ...142 CP series Expansion I O Unit Wiring Section 3 6...
Page 372: ...338 Analog I O XA CPU Units Section 5 5...
Page 578: ...544 Trouble Shooting Section 8 7...
Page 622: ...588 Sample Application Section 9 12 Network Settings Network Tab Network Settings Driver Tab...
Page 668: ...634 Standard Models Appendix A...
Page 744: ...710 Auxiliary Area Allocations by Address Appendix D...
Page 771: ...737 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 772: ...738 Connections to Serial Communications Option Boards Appendix F...
Page 800: ...766 Specifications for External Power Supply Expansion Appendix H...
Page 806: ...772 Index W Work Area 165 work bits 165 work words 165 write protection 379...
Page 808: ...774 Revision History...
Page 809: ......